If you’re a woman, chances are your boobs are a major part of your life. Maybe you’re used following how they get bigger and small with your cycle— or even how they manage to get so damn sore that you feel like they may burst into flames. But boobs are complex and complicated— and chances are that in school, they skipped over all of the important parts. Most of us barely got sex ed and some of us didn’t get it all, so it’s up to us to educate ourselves about our breasts.

Now, it’s no surprise that your boobs change as you grow up. Anyone who has found a random nipple hair will know that (Oh, come on— you definitely have. Stop pretending.). But while things like gravity taking its toll and hairs sprouting in the weirdest of places maybe be obvious, other changes will be taking place that you don’t even know about. So we have to learn about our boobs, about boobs generally, about how they change... basically, there’s a whole lot of sh*t to learn. Luckily, there’s loads of information out there.

So here are some facts about boobs that you definitely didn’t learn in school, because an extra nipple is way more common than you think.

13. They Aren't Light

Boobs are amazing, sexy... and hilarious. There's a whole lot going on down there— and a lot to learn. They're an important body of so many women's bodies, so make sure that you get educated. Your boobs need you.

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